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The increased demand for distribution of telecommunication services over survivable network architectures led to the identification of resilient ring architectures as a very desirable network option. With the recent development of rings employing Subnetwork Connection Protection (SNCPrings) numerous complex solutions can be achieved in the design of survivable SDH subnetworks. In this paper, the methodology for the strategic planning of survivable SDH SNCP-ring subnetworks is presented and analysed. The various subnetwork solutions are classified. The trade-offs of the different solution types for subnetwork planning are introduced and the factors affecting them are discussed. Three algorithms for optimising the planning of equipment cost-effective SDH subnetworks using SNCP-ring solutions have been implemented. Results, indicating the efficiency of the algorithms and the factors affecting it, supported by simulation work, are presented and discussed.

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